3 avril 2014
Selon la NRC, l’arrêt se serait bien effectué. Cependant la situation des barres de contrôle, l’alimentation électrique, ainsi que la distribution du courant fourni par le groupe diesel de secours sont totalement confuses. La seule chose claire est que le cœur du réacteur n’était pas sous-critique.
Arkansas 2 : Type PWR - Puissance 3 026 MWth - 1ère divergence 12/1978
Available in english only.
Event Number : 49995 - Facility : ARKANSAS NUCLEAR - 4 State : AR -
Unit : [2] RX Type : [2] CE
Event Date : 04/03/2014 - Event Time : 13:01
Emergency Class : NON EMERGENCY 10 CFR Section :
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Initial PWR : 100 % Current PWR : 0 %
Event Text
AUTOMATIC REACTOR TRIP
"At approximately 1301 [CDT] on 4/3/2014, Unit 2 tripped from 100% power for unknown reason(s). All Control Element Assemblies [CEA] inserted into the core. (Note that CEA 03 Plant Monitoring System indication still indicates fully withdrawn. However, CEA 03 in-limit light and control panel indication validate that CEA 03 is fully inserted.) 4160v bus 2A1 and 6900v bus 2H1 transferred to Startup Transformer #2. 4160v bus 2A2 appeared to de-energize and re-energize on Startup Transformer #3. 6900v bus 2H2 is de-energized. 2K4B emergency diesel generator started but did not tie onto the 2A4 4160v bus. Emergency Feedwater actuated on low steam generator level."
Offsite power remains available and decay heat is being removed to the main condensers using the turbine bypass valves. Unit 1 was not affected.
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